Sorry, I don't do Messengers of any type, and no need to apologize for your English, mine isn't so great either. I take it that by one piece guitar, that your mean the body, neck and headstock will all be cut from the same block of wood, one unit, although that will require a very large piece of wood, it really wouldn't be more difficult than a neck-thru design. Do you have any diagrams or measured drawings of a SG? The angle of the neck is very important to the playing action and for the TOM style bridge, also the angle of the headstock is very important. This is a very ambitious project, I would say that you have much research to do, if you haven't done so already, Good Luck,
....... Are you from Portugal, Brazil or the Azore's ?
BTW, I agree with Lordathestrings, Maple would be a very good choice of wood, a very clear sound and your design will require a very strong wood..........

[Edited by pstring on 08-26-2002 at 10:58 PM]